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Патент USA US3062544

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Nov. 6, 1962
R. w. BENSON ETAL
3,052,534
SHEET FEED MECHANISM
Filed July 5, 1961
12 Sheets-Sheet 1
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INVENTORS
ROBERT W. BENSON
JOHN F. WIRLEY
.4 T TORNE V
NQV- 6, 1962
R. w. BENSON ETAL
3,062,534
SHEET FEED MECHANISM
Filed July 5, 1961
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l2, Sheets-“Sheet 2
INVENTORS
I
ROBERT W. BENSON
JOHN F. WIRLEY
A T TORNE V
Nov. 6, 1962
R. w. BENSON ETAL
3,062,534
SHEET FEED MECHANISM
Filed July 3, 1961
12 Sheets-Sheet 3
INVENTORS
ROBERT W. BENSON
JOHN F. WIRLEY
ylM/w
NOV- 6, 1962
R. w. BENSON ETAL
3,062,534
SHEET FEED MECHANISM
Filed July 3, 1961
l2 Sheets-Sheet 4
INVENTOR?
ROBERT W. BENSON
JOHN F. WIRLEY
ATTORNEY
Nov. 6, 1962
R. w. BENSON ETAL
3,062,534
SHEET FEED MECHANISM
Filed July 3, 1961
l2 Sheets~$heet 5
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INVENTORS
ROBERT W. BENSON
JOHN F. WIRLEY
A TTOR/VEV
N0“ 6, 1962
R. w. BENSON ETAL
3,062,534
T FEED MEC A
Filed July 5, 1961
12 Sheets~$heet 6
INVENTORS
ROBERT W. BENSON
JOHN F. WIRLEY
Nov. 6, 1962
R. w. BENSON ETAL
3,062,534
SHEET FEED MECHANISM
Filed July :5, 1961
l2 Sheet5"$heet 7
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INVENTORS
ROBERT w. BENSON
JOHN F- WIRLEY
ATTORNEY
Nov. 6, 1962
R. w. BENSON ETAL
3,062,534
SHEET FEED MECHANISM
Filed July 3, 1961
12 Sheets-Sheet 8
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4 24,422
449
INVENTORS
ROBERT W. BENSON
JOHN F. WIRLEY
ATTORNEY
NOV- 6, 1962
R. w. BENSON ETAL
35062534
- SHEET FEED MECHANISM
Filed July 5, 1961
12 Sheets-Sheet 9
INVENTOILS
ROBERT W. BENSON
JOHN F. WIRLEY
Nov. 6, 1962
R, w_ BENSON ETAL
3,062,534
SHEET FEED MECHANISM
Filed July 3, 1961
.12 Sheets~$heet l0
INVENTOR5
ROBERT W. BENSON
NOV. 6, 1962
R. w. BENSON ETAL
3,062,534
SHEET FEED MECHANISM
Filed July 3, 1961
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INVENTORS
BY
ROBERT W. BENSON
JOHN E WIRLEY
7“ 10/94»
ATTORNEY
Nov. 6, 1962
R. W. BENSON ETAL
3,062,534
SHEET FEED MECHANISM
Filed July 3, 1961
12 Sheets~$heet 12
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INVENTORS
ROBERT W. BENSON
JOHN E WIRLEY
Arromgf _
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ire States Patent ‘l1v
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3,062,534
Patented Nov. 6, 1962
2
1
A further object of this invention is to improve sheet
3,062,534
SHEET FEED MECHANISM
Robert W. Benson, Rochester, and John F. Wirley, Web
ster, N.Y., assignors to Xerox Corporation, Rochester,
N.Y., a corporation of New York
Filed July 3, 1961, Ser. No. 121,784
3 Claims. (Cl. 271-—36)
This invention relates in general to xerographic ap
paratus and, in particular, to a sheet transfer material
feeding mechanism by which sheets of transfer material
are fed seriatim to a xerographic drum.
More speci?cally, the invention relates to an improved
sheet transfer material feeding mechanism that is par
ticularly adapted for use in xerographic reproducing 15
machines, and is also suitable for use with comparable
types of devices.
In the process of xerography, for example, as disclosed
in either Carlson Patent 2,297,691, issued October 6,
1942, or in Carlson Patent 2,357,809, issued September
12, 1944, a xerographic plate, comprising a layer of
photoconductive insulating material on a conductive
backing, is given a uniform electric charge over its sur
face and is then exposed to the subject matter to be
reproduced, usually by conventional projection tech
niques.
This exposure discharges the plate areas in ac
cordance with the radiation intensity that reaches them
and thereby creates an electrostatic latent image on or
in the plate coating.
Development of the image is effected with developer
feeder mechanisms for use in a xerographic apparatus
having a movable xerographic plate capable of having a
xerographic image formed anywhere on its photoconduc
tive surface.
For a better understanding of the invention as well
as other objects and further features thereof, reference
is had to the following detailed description of the inven
tion to be read in connection with the accompanying
drawings, wherein:
FIG. 1 illustrates schematically a preferred embodi
ment of a xerographic apparatus adapted for continuous
and automatic operation and incorporating an optical
scanning mechanism;
FIG. 2 is a right-hand perspective view of the xero
graphic apparatus with parts of the desk covering
broken away to show the arrangement of the xerographic
machine elements;
FIG. 3 is a left-hand perspective view of the xero
graphic apparatus with the parts of the desk covering
broken away to show the arrangement of the xerographic
machine elements;
FIG. 4 is a right-hand perspective view, partly in sec
tion, of the paper feed mechanism of the apparatus;
FIG. 5 is a side sectional view of the image transfer
station of the xerographic appartus and associated
elements;
FIG. 6 is a right-hand perspective view of the paper
feed tray removed from the xerographic apparatus;
30
FIG. 7 is a top view of the paper feed tray;
FIG. 8 is a sectional view taken along line 8—8 of
material or developers which comprise, in general, a mix
ture of a suitable pigmented or dyed electroscopic powder,
FIG. 7;
FIG. 9 is a sectional view taken along line 9—9 of
hereinafter referred to as toner, and a granular carrier
material, which later functions to carry and to generate
FIG. 7;
FIG. 10 is a sectional view taken along line 10—10
triboelectric charges on the toner. More exactly, the 35
function of the granular material is to provide the me
of FIG. 7;
FIG. 11 is a sectional view taken along line 11-11 of
chanical control of the powder, or to carry the powder
to an image surface and, simultaneously, to provide
FIG. 7;
FIG. 12 is a sectional view taken along line 12--12 of
almost complete homogeneity of charge polarity. In the
development of the image, the toner powder is brought 40 FIG. 7;
into surface contact with the coating and is held thereon
electrostatically in a pattern corresponding to the elec
tray with parts broken away to show the arrangement of
trostatic latent image. Thereafter, the developed xero
the back guide assembly;
FIG. 13 is a bottom view of a portion of the paper
FIG. 14 is a sectional view of the paper separator roller
graphic image is usually transferred to a support or trans
fer material to which it may be ?xed by any suitable 45 and associated elements;
FIG. 15 is a sectional view of the paper separator roller
means.
Since the disclosure of the basic concept of xerography
by Carlson, a variety of machines and devices have been
drive and tensioning elements;
proposed to incorporate such teachings in a manner to
form copy xerographicaily on a commercial basis. For
the clutch mechanism of the invention for controlling
the operation of the paper feed system;
the most part, each of such devices has been speci?cally
designed to the solution of a particular reproduction
problem and, for the most part, has been limited to the,
particular use intended. Although certain of these
FIG. 17 is a sectional View of the clutch mechanism
of the paper feed system;
FIG. 18 is a side view of the electromagnetic clutch
mechanism and its contacts, with parts broken away to
FIG. 16 is a front view of a preferred embodiment of
machines are presently in wide commercial use, none 55 show details of the contacts; and,
can be considered to be of general application of the type
required in most business offices. For example, prior
FIG. 19 is a simple schematic electrical wiring diagram
of the clutch circuit.
Referring now to the drawings, there is shown in FIGS.
art machines are usually limited as to the type of origi
1, 2 and 3, a xerographic apparatus used for producing
nal that may be used therewith, or as to the type and size
of transfer material that can be employed therein, or as 60 xerographic reproductions from a stationary original, the
to the ?exibility of operation of the machine itself.
It is therefore the principal object of this invention to
improve the sheet feeding mechanism for use in auto
original being either transparent, translucent or opaque
copy, Whether in the form of single sheets, books, or in
three-dimensional form. To conform to modern o?ice
matic xerographic apparatus in which a reusable xero
decor the xerographic apparatus is adapted for installa
graphic plate may successively be charged, exposed and
developed, and in which the developed image may readily
tion in a suitable desk, constructed so that an operator
seated at the desk may conveniently control all opera
be transferred to a sheet of transfer material, such as
tions of the apparatus.
paper or similar material, and thereby permit continuous
reuse of the xerographic plate.
Another object of this invention is to improve sheet
feeding mechanisms for feeding sheets seriatim to a
rotating drum independently of the drum’s rotative cycle.
The desk, generally designated 1, constructed in a con
ventional manner, has mounted on the top and in the right
hand corner thereof, a main control panel for initiating
the operation of the machine and for selecting and indi
cating the number of reproductions to be made, and a
»
3,062,534
3
collecting tray 2 for ?nished reproductions, usually made
on paper. Although the reproductions may be discharged
from the apparatus for collection at any point accessible
A.
may consist of a transparent plate member such as, for
example, a glass plate or the like positioned parallel to the
externally of the machine, it is preferred that the discharge
top of the desk, which is adapted to support a master or
original, such as book 18 placed face downward on its
terminal of the reproduction or paper feed means be em
upper surface, the copyboard being uniformly illuminated
bodied in a super-structure 4 overhanging the rear portion
and arranged in light-projecting relation to the moving
of the desk top, said super-structure also housing the main
control panel 3 of the apparatus. Thus the document
light-receiving surface of the xerographic drum 20. Uni
form lighting is provided by a pair of lamps attached to
holder or copyboard 5 and its covering platen 6 can be
a slotted light re?ector mounted for movement to traverse
left unobstructed at the front part of the desk over the 10 the plane of the copyboard.
knee space.
In the lower right-hand corner of the desk is a second
control panel 7 for additional control circuits and for
A light shield adapted to protect the xerographic drum
from extraneous light is positioned adjacent to the surface,
of the xerographic drum. A slot aperture in the light
levers to control the length of scan, to control the ten
shield extends transversely to the path of movement of
sions of the paper separator rollers on a stack of paper 15 the light-receiving surface of the xerographic drum 20
to adjust for different paper weights, and for controlling
to permit re?ected rays from the copyboard to be di-‘
the toner dispensing rate of the machine.
As shown schematically in FIG. 1, the xerographic
rected against a limited transverse area of the light-receiv
ing surface as it passes therebeneath. As shown, the light
apparatus comprises a xerographic plate including a photo
shield also encloses the corona charging device 22.
conductive layer or light-receiving surface on a conduc
To enable the optical system to be enclosed within a
tive backing and formed in the shape of a drum, generally
conventional-size desk, a folded optical system including
designated by numeral 20, which is mounted on a shaft
an object mirror, a lens, and an image mirror is used in
journaled in a frame to rotate in the direction indicated,
the preferred embodiment of the apparatus.
by the arrow to cause the drum surface sequentially to
The lens element positioned between the copyboard
pass a plurality of xerographic processing stations.
2 5 and the light shield is arranged for movement in a path
For the purpose of the present disclosure, the several
to traverse the plane of the copyboard in timed relation
xerographic processing stations in the path of movement
of the drum surface may be described functionally, as
to the movement of the light source, whereby the subject
image of the original supported by the copyboard is
follows:
i
scanned in timed relation to the movement of the light
A charging station, at which a uniform electrostatic 30 receiving surface of the xerographic drum to project a
charge is deposited on the photoconductive layer of the
light image corresponding to the subject image onto the
xerographic drum;
.
surface of the xerographic drum.
An exposure station, at which a light or ‘radiation pat
Adjacent to the exposure station is a developing station
tern of copy to be reproduced is projected onto the drum
C, in which there is positioned a developer apparatus 26
surface to dissipate the electrostatic charge on the drum 35 including a casing or housing having a lower or sump por
surface in the exposed areas thereof and thereby form
tion for accumulating developing material 30. A bucket
a latent electrostatic image of the copy to be reproduced;
type conveyor having a suitable driving means, is used
A developing station, at which a xerographic develop—
to carry the developing material to the upper part of the
ing material including toner particles having an electro
developer housing where it is cascaded down over a hop
static charge opposite to that of the electrostatic latent 40 per chute onto the xerographic drum.
image are cascaded over the drum surface, whereby the
As the developing material is cascaded over the xero
toner particles adhere to the electrostatic latent image to
graphic drum, toner particles are pulled away from the
form a xerographic powder image in the con?guration 'of
carrier component of the developing material and de
the copy to be reproduced;
posited on the drum to form powder images, while the
A transfer station, at which the xerographic powder
partially denuded carrier particles pass off the drum into
image is electrostatically transferred from the drum sur-'
the developer housing sump. As toner powder images
face to a transfer material or support surface; and,
are formed, additional toner particles must be supplied
A drum cleaning and discharge station, at which the
to the developing material in proportion to the amount
drum surface is brushed to remove residual toner parti
of toner deposited on the drum. For this purpose, a toner
cles remaining thereon after image transfer, and at which
the drum surface is exposed to a relatively bright light
source to effect substantially complete discharge of any
residual electrostatic charge remaining thereon.
The charging station is preferably located as indicated
by reference character A. In general, the charging ap
paratus or corona charging device 22 includes a corona
discharge array of one or more corona discharge elec
trodes that extend transversely across the drum surface
and are energized from a high potential source and are
substantially enclosed within a shielding member.
Next subsequent thereto in the path of motion of the
xerographic drum is an exposure station B. This exposure
station may be of one of a number of types of mecha
nisms or members such as desirably an optical scanning or
projection system or the like, designed to project a line
copy image onto the surface of the photoconductive xero
graphic drum from a stationary original. To permit
dispenser, generally designated 28 of the type disclosed
in copending Hunt application, Serial No. 776,976, ?led
November 28, 1958, is used to accurately meter toner to
the developing material.
Positioned next and adjacent to the developing sta
- ‘tion is the image transfer station D which includes a
sheet feeding mechanism adapted to feed sheets of paper
successively to the xerographic drum in coordination with
the presentation of the developed image on the drum at
the transfer station.
This sheet feeding mechanism,
generally designated 32, includes a sheet source, such as
a tray, for a plurality of sheets of a suitable transfer
material, that is, typically, sheets of paper or the like, a
separating roller adapted to feed the top sheet of the
stack to feed rollers which direct the sheet material into
contact with the rotating drum at a speed preferably
magazines and other types of cumbersome three-dimen
sional objects to be copied for the reproduction of speci?c
slightly in excess of the rate of travel of the surface of
the drum in coordination with the appearance of the
developed image at the transfer station. In this manner,
the sheet material is introduced between the feed rollers
information contained thereon, the optical projection sys
and is thereby brought into contact with the rotating
substantially any type of original copy, including books,
tem shown is of the type disclosed in copending Mayo ap
drum at the correct time and position to register with
plication, Serial No. 783,388, ?led December 29, 1958.
the developed image.
The optical scanning or projection assembly, generally
designated 24, comprises a stationary copyboard 5, which
the sheet transfer material with the feed rollers and to
direct the sheet transfer material into contact with the
To effect proper registration of
3,062,534
5
6
through the ?lter bag so that only clean air reaches the
drum, suitable guides are positioned on opposite sides
of the feed rollers.
The transfer of the xerographic powder image from
the drum surface to the transfer material is effected by
rneans of a corona transfer device 34 that is located at or
immediately after the point of contact between the trans
fer material and the rotating drum. The corona transfer
device 34 is substantially similar to the corona charging
device that is employed at charging station A, in that it
includes an array of one or more corona discharge elec
motor-fan unit.
Any residual electrical charge remaining on the xero
CI
graphic drum is'dissipated by light from a ?uorescent
lamp mounted in a suitable lamp housing hinged to the
dust hood, a starter being provided for energizing the
?uorescent lamp.
Suitable drive means drive the drum, lens element, and
slotted light re?ector at predetermined speeds, relative to
10 each other and included are means to return the lens ele
ment and the slotted light re?ector to their respective
traverse starting positions and means to effect opera
tion of the bucket-type conveyor, toner dispenser, endless
conveyor, vertical conveyor; the separating roller and feed
her. In operation, the electrostatic ?eld created by the
corona discharge device is effective to tack the transfer 15 rollers being controlled in a manner to permit the feed
of a sheet of transfer material into registered contact with
material electrostatically to the drum surface, whereby
the developed image on the xerographic drum as it is
the transfer material moves synchronously with the drum
rotated through the transfer station. Stated in a different
while in contact therewith. Simultaneously with the tack
trodes that are energized from a suitable high potential
source and extend transversely across the drum surface
and are substantially enclosed Within a shielding mem
ing action, the electrostatic ?eld is effective to attract the
manner, a sheet of transfer material is advanced in time
toner particles comprising the xerographic powder image 20 relation to the start of scan of the leading edge of copy.
from the drum surface and cause them to adhere electro
statically to the surface of the transfer material.
Referring now to FIGS. 2 and 3, there is shown the
general arrangement of the xerographic apparatus within
Immediately subsequent to the image transfer station
the desk. 1. As shown, there is provided a frame for
supporting the components of the apparatus formed by a
there is positioned a transfer material stripping apparatus
or paper pickoff mechanism, generally designated 36, for 25 base plate 10 to which are mounted full front and rear
plates 11 and 12, respectively, and partial plate 13. The
removing the transfer material from the drum surface.
plates are connected together and maintained rigidly in
This device includes a plurality of small diameter, multiple
spaced relation to each other by suitable tie plate, not
outlet conduits of a manifold that is supplied with pres
surized aeriform ?uid by a pulsator operated by a suitable
shown.
power means. The pulsator is adapted to force jets of 30
As shown in FIG. 2, the xerographic drum 20 is
pressurized aeriform ?uid through the outlet conduits into
mounted on horizontal driven shaft 81-16 and the drum
is positioned on the exposed front face of front plate 11,
contact with the surface of the drum slightly in advance
with the vmajor xerographic components of the machine
of the sheet material to strip the leading edge of the
sheet material from the drum surface and to direct it onto
mounted around the drum either on the exposed front
face of plate 11 or between plate 11 and partial plate 15.
an endless conveyor 38 whereby the sheet material is
The main drive elements and controls for the xero
carried to a ?xing device, such as, for example, heat
fuser (t2, whereby the developed and transferred xero
graphic components are mounted between front and rear
graphic powder image on the sheet material is per
plates 11 and 12, respectively, as shown in FIG. 3, and
manently ?xed thereto.
they include as major components thereof, a main drive
After fusing, the ?nished copy is preferably discharged 40 motor MOT-1, a scan control mechanism 48 for op
from the apparatus at a suitable point for collection
erating the movable elements of the optical system 24, a
externally of the apparatus. To accomplish this, there
programmer 50 for actuating the operation of the paper
is provided a vertical conveyor, generally designated 44,
feed system 32 and paper pickotf mechanism 36, a clutch
mechanism 52 for effecting alternate operation of the
by means of which the copy is delivered to a copy holder
or collecting tray positioned in a suitable super-structure re. Si separator and feed rollers in the paper feed system, and
overhanging the rear portion of the desk top.
a lever control system 54 for adjusting the length of scan,
The next and ?nal station in the device is a drum
toner dispensing rate, and separator roller tension.
it is believed that the foregoing description is suffi
cleaning station E, having positioned therein a drum
cient for the purpose of this application to show the general
cleaning device ‘46 adapted to remove any powder remain
ing on the xerographic drum after transfer by means of 50 operation of the xerographic apparatus. For further de
tails concerning the speci?c construction of the xero
a rotating brush and whereby the xerographic drum is
graphic copier-duplicator shown, reference is made to
?ooded with light to cause dissipation of any residual
copending Mayo et al. application, Serial No. 824,500,
electrical charge remaining on the xerographic drum.
To remove residual powder from the xerographic drum,
?led July 2, 1959.
Paper Feed System
there is disposed a cylindrical brush rotatively mounted 55
on an axle. For collecting powder particles removed
Referring now to the paper feed system, the sheet
from the xerographic drum by the brush there is pro
vided a dust hood that is formed to encompass approxi
mately two-thirds of the brush area. To insure thorough
cleaning of the brush a flicking bar is preferably secured
to the interior of the dust hood adjacent the edge of the
exhaust duct and in interfering relation with the ends
of the brush bristles whereby dust particles ‘may be dis~
lodged therefrom.
For removing dust particles from the brush and dust
hood, an exhaust duct is arranged to cover a slot that
extends transversely across the dust hood and is con
nected to a ?lter bag in the ?lter box. A motor—fan
feeding mechanism 32, positioned in the image transfer
station D, for seriatim feeding of cut-sheet transfer
material into contact with the xerographic drum so that
the developed powder images on the surface of said drum
may be transferred to the transfer material, consists of a
tray for holding a supply of cut-sheet transfer material,
separator rollers for separating a single sheet of transfer
65 material from said supply, feed rollers for feeding a single
sheet into contact with the drum and means for coordinat
ring the operation of the separator rollers and feed rollers
to thereby feed a single sheet of transfer material into
contact with the drum for proper registration of the pow
unit, connected to the ?lter box, produces a ?ow of 70 der image on the drum onto the transfer material.
air through the ?lter box drawing air through the area
Referring now speci?cally to FIGS. 4 through 19, in
surrounding the xerographic drum and the dust hood,
clusive, the apparatus for feeding sheets of transfer ma
the air entraining powder particles removed from the
terial to the xerographic drum 29 in timed relation to the
appearance of a developed image thereon includes a pair
drum by the brush as the air ?ows through the dust hood.
Powder particles are separated from the air as its ?ows 75 of forwarding or feed rollers 401 and 492, usually made
8
7
of rubber or similar material, mounted in cooperative
relation to each other in front of guides 4&3 and 4%
which direct sheets of transfer material forwarded by
suitable set screws, not shown, extends from opposite
sides of the back guideplate to support the margin guides
said feed rollers into contact with the drum 2% at a point
at or slightly in advance of the corona transfer device 34.
Feed roller 401, which is a driven roller, is mounted
To permit lateral adiustment of the margin guides, each
416 and 417, which are suitably bored to slide on the shaft.
of the margin guides is bored, as shown in FIG. 11, to
receive a detent 432, in the form of a ball, which is biased
by spring 4-33 into one of the suitably positioned notches
in position by shaft SE40 journaled in frame plates 11
formed in the shaft, whereby the margin guides can be
and 13 and is driven by pulley 465 secured to the end of
readily indexed by the operator into the desired position
shaft 81-49. Feed roller 402, which is an idler roller,
is mounted on shaft SSH-8 journaled at its ends in arms 10 for paper of various widths.
To aid the operator to quickly and correctly position a
4% pivotally mounted on frame plates ill and 13, the feed
stack of paper in the tray, the shaft 431 is provided at
roller 4192 being yieldingly biased against the feed roller
opposite ends with two duplicate scales for lateral posi
46d by means of springs 4-07 so that feed roller 402 is
tioning of the stack, and the angle plate 414 is provided
driven by frictional engagement with roller 4433. or with
with a scale for longitudinal positioning of the stack, suit
a sheet of transfer material interposed between said rollers.
able index markers being provided on the margin guides
A supply of cut sheet material that is, typically, sheets
and on the back guide plate for the convenience of the
of paper or the like, to be fed one at a time to the
operator in determining the proper location of these
feed rollers 401 and 482 is held in a paper tray 4% slid
elements.
ably positioned at the front of the machine between frame
Side frictional retention of the stack, to permit single
20
plates 11 and 13.
feeding of the sheets is obtained by means of pressure
The paper tray, includes a base member 409 having
pads 434, usually made of rubber or other suitable ma
angle plates 413 and 414 secured thereon, as by welding,
the angle plates being positioned with their upright legs
terial, carried by the margin guides 416 and 417. The
parallel to and adjacent the sides of the base member and
with their lateral legs partially extending over the center
pressure pads 434 are mounted in such fashion that they
can be replaced wherever desired. Each pad is secured,
as by cement, to a sheet metal carrier 435 having a bent
upper hook portion adapted to be inserted through a suit
able aperture in the bracket 436, whereby the carrier,
with the pad thereon, is somewhat loosely secured to
channel of the base member to form a slot 415.
Sheets of paper or other material are positioned both
longitudinally and laterally on the tray by means of
margin guides 416 and 417 adjustably mounted on the
tray by means of shaft 431 in a manner to be described. 30 permit slight movement of the carrier to adjust the pad
against the side margin of the stack. The bracket, formed
Each of the margin guides 416 and 417, formed com
plementary to each other, is provided with an upright side
leg, an upright back leg at right angles to the side leg to
guide the side and back edge, respectively, of the paper,
as a bent leaf spring, is secured at one end by screws
424 to the side of a margin guide with the free end
The margin guides are adjustably positioned on the tray
of the spring extending beyond the front of the margin
guide in position to normally bias the pressure pad against
the side margin of a stack. To facilitate the placing or
removal of a stack of paper on the tray there is provided
by means of a back guide assembly 418 adapted to be
a cam 437 on lever arm 438 loosely journaled in suitable
selectively positioned along the length of the tray. Back
guide assembly 418 includes a back guide plate 419
4.0 free end of a bracket 436 can be cammed away from
adapted to ride on the top surface of the tray and is cen
tered on the tray by means of a depending narrow bar
the side of a stack of paper by rotation of the lever arm
by means of lever 439 secured at one end thereof.
portion of the back guide plate which is adapted to ride
To further assure the feeding of sheets singly from the
stack of paper, there is provided a drag roller 441, that
and a lateral extending leg adapted to rest on the top of
the paper tray.
slots formed in the side of the margin guide whereby the
in slot 43.5. Leaf spring 421, secured to the bar portion,
retains the back guide plate 419 on the tray, while the left
hand edge of the bar portion is biased against the edge
of left-hand angle plate 413 by means of leaf springs 422
secured at one end by screws 424 to the front of the back
guide plate.
The free ends of the leaf springs 422 are
guided by means of a spring guide 423 secured to the I
rear of the back guide plate by screws 424.
To permit longitudinal positioning of the back guide
plate on the tray, a latch 425 is pivotably mounted on
a latch shaft 426 positioned in a suitable groove formed
in the back of the back guide plate and secured thereto
by shaft support blocks 427 secured by screws 424 ex
tending through the shaft support blocks and threaded into
the back guide plate. The latch 425 is provided with a
leg portion, as seen in ‘EEG. 10, adapted to slide into the
notched or indented portions of the right hand angle 63
plate 414, whereby the longitudinal position of the back
guide plate can be maintained as desired. The leg portion
of the latch 425 is normally biased upward into locking
position in a notched or indented portion of the angle
plate by means of a latch spring 423 positioned normal to
leaf spring 421, both springs being held in position by
is adjustably positioned, when in its operative position to
rest on the top most sheet of the stack.
To obtain this
result the drag roller 441 is rotatably journaled on axle
442 secured at opposite ends in the ends of a pair of arm
443 rotatably mounted on shaft 431 on opposite sides
of the back guide plate. The drag roller, preferably made
as a solid piece, because increased weight of this mem
ber is desired, is arranged in its operative position ad
jacent the rear end of the stack so that, as the trailing
edge of the top most sheet of the stack is advanced only
a short distance from under the drag rollers, the drag
roller will be immediately effective to place a drag resist
ance on the next sheet to prevent its advance to any un
desirable degree, by friction from the top most advancing
sheet. When a stack of paper is to be inserted into the
paper tray, the drag roller is moved out of the way to an
inoperative position by merely rotating the arms around
the shaft 431.
To prevent the bottom sheet of the stack of paper from
being inadvertently drawn forward by the feeding and
separating rollers 451, pads 412, usually made of rubber
or other suitable material, are provided at the front of
the paper tray.
Right-hand bracket 446 and left-hand bracket 447
connected to base plate 1d are adapted to support the
back guide assembly the operator depresses the upper
curved portion of the latch toward shaft 431 thereby 70 paper tray assembly by means of a pair of commercial
type drawer slides 448. As shown in FIGS. 4 and 6,
pivoting the latch about latch shaft 426 to disengage
the male portions of the slides are secured to the angle
the leg portion from the notched or indented portions of
cover plate 429 secured by screw 424 to the underside
of the back guide plate. When it is desired to move the
the right hand angle plate 414.
Shaft 431 mounted in the bored portion of the back
guide plate 419, and secured in alignment therein by 75
plates 413 and 414, and the complementary portions of
the slides are secured to the brackets 446 and 447.
As shown, in FIG. 5, the paper tray is maintained in
3,062,534.
10
operative relation to the feeding and separating roller
As shown, cam arm 494, having a cam riser at one
for seriatim feeding of sheets therefrom by means of
a spring detent assembly 449 fastened to channel 14,
forming part of the desk frame, positioned on the under
side of base plate 11). The spring detent engages a de
pending leg 411 of the base member 41319 of the paper
end thereof is secured at its opposite end, as by welding,
tray.
to sleeve 475 connected as described by means of arm
shaft 481 and arm pins 482 to the arm 454, whereby
movement of the cam arm 494 effects an equal move
ment of arm 454. To effect movement of cam arm 494,
as the paper tray 408 is moved into or out of its normal
To feed sheets of transfer material one at a time from
operating position, the cam follower 495 is secured to a
the paper tray 4115 into the bite of the feed rollers, there
cam follower support 496 ?xed to the vertical leg of
is provided a paper feeding and separating means com 10 angle plate 413 of paper tray 498.
prising intermittently driven rollers 451 ?xedly mounted
Both the operation of the paper separator rolls 451
upon shaft 452 journaled in bearings 453 mounted in
arm 454 adapted to swing about the axis of driven shaft
455. As shown in FIG. 14, the arm 454 consists of arm
shells 456 and 457 butted together and held in place by
screws 458 extending through the arm shells to be
threaded into spacers 459.
The means for driving the rollers 451 comprises pulley
461 secured to a conventional slip clutch 462, and pulley
463 mounted on shafts 452 and 455, respectively, and
operatively connected together by means of timing belt
and the paper feed roll 401 is effected by the clutch
mechanism 52 of the invention actuated by a program
mer 50 of the type disclosed in the referenced Mayo
et a1. application.
As illustrated in FIGS. 3, 4, 16, 17 and 18, clutch
mechanism 52 which is mounted between frame plates
11 and 12, include a shaft SH-7 bored at opposite ends
to receive bearings 5111 whereby the shaft is journaled
for rotation on the reduced end portions of spindles 502
extending through suitable apertures in the frame plates
464.
11 and 12 and retained in place by screws 503.
The slip clutch 462 permits the rollers 451 to be re
Shaft SH—7 is connected operatively to the main drive
tated either by timing belt 464 or by frictional contact
motor MOT-1 of the machine by belt 504, which runs
with a sheet of transfer material as it is pulled forward by 25 on compound pulley 505 ?xed to shaft SH—7 by pins 506
feed rollers 4111 and 4112.
and on a pulley, not shown, connected to the motor.
Shaft 455 which is journaled by bearing 465 in frame
Mounted on the shaft for rotation relative to the shaft
13 and by bearing 466 in arm shell 456 is normally biased
are a pair of clutch elements 511 and 512 forming a ?rst
to the left as seen in FIG. 14, by means of spring 457
clutch element and a second clutch element, respectively,
interposed between snap ring 468 on shaft 455 and shaft
of the clutch mechanism. The clutch elements are ro
encircling washer 471 butted against frame 13. As shaft
tatably supported on the outer races of bearings 507
455 is forced to the left, the opposite or notched end of
mounted in spaced relation on the shaft. The outer races
the shaft is forced into the aperture in the end of shaft
of the bearings are held against the bored shoulder por‘
SET-11 to engage drive pin 473 secured therein. As
tions of the clutch elements by retaining rings 503
shown, in FIG. 15, shaft SH—11 which is journaled in
bearings 464. positioned in frame 12 and in sleeve 475,
has an intermittently driven pulley 476 secured thereon.
Washers 4'77 and 475 ride against a shoulder on shaft
SH-1ll to prevent axial movement of said shaft to the left
as seen in FIG. 15.
To adjust the pressure of rollers 451 on the stack of
transfer material in paper tray 4198, the arm 454 is ?xed
to one end of arm shaft 481, the opposite end of the arm
shaft being notched to engage drive pins 452 secured to
the counter-bored end of sleeve 475 journaled in frame
11, the sleeve being retained against axial movement to
the right as seen in FIGS. 14 and 15 by snap ring 453
secured in a suitable groove formed in the sleeve.
positioned in suitable annular grooves formed in the
clutch elements.
Clutch element 511 is provided with peripheral teeth
and is in effect a drive pulley connected, as shown in
FIG. 4, by timing belt 522 to driven pulley 476 to
40 operate the paper separator rollers 451.
In a similar
manner, clutch element 512 is also provided with
peripheral teeth and is a drive pulley connected by tim~
ing belt 524 to driven pulley 4&5 to operate the paper
feed roll 401.
Mounted between the clutch elements, and adapted to
coact therewith is a third clutch element or armature
514 forming with clutch elements 511 and 512 an
electromagnetic clutch assembly.
A spring tension sleeve 454, having gear 485 secured
To permit the armature to rotate with the shaft while
thereon by (pins) 479, is loosely mounted by a bearing 50 being free for relative movement with respect to the axis
464 adjacent sleeve 475 on shaft SH-ll, and is axially
of the shaft, the armature is mounted on splined hub 515
aligned on the shaft by thrust bearing 486 abutting snap
secured as by key 516 to rotate with the shaft.
ring 487 positioned in a suitable groove on the shaft.
Torque is applied by means of coil spring 488 secured at
one end by spring pin 491 to sleeve 475 and at its op
posite end to spring tension sleeve 454 by having the end
of the spring forced into a suitable aperture in said
spring tension sleeve. By rotating gear 485 by means of
chain 485 operated in a suitable manner (not shown) by
The second clutch element 512 and the adjacent face,
right-hand face as seen in FIG. 17, of armature 514 are
provided with annular friction pads 517 suitably secured
thereon whereby the clutch element 512 is driven by the
armature through contact of the annular friction pads.
The armature, which is normally ale-energized, is biased
into driving engagement with clutch element 512 by
means of spring 518 encircling bushing 521 loosely
a control lever of lever control system 54 in lower con‘
trol panel 7, roller pressure on the stack of paper in
mounted on shaft SH-7. One end portion of the spring
paper tray 4% can be adjusted by an operator to accorn'
engages the shoulder of bushing 521 and the opposite end
modate any weight paper used as a transfer material.
portion of the spring engages the bored shoulder por
lnterposed between rollers 451 and feed rollers 401
tion of armature 514.
and 4112 there is provided, as shown in FIGS. 4 and 5, 65
The force of spring 518 should be su?icient to force the
a pair of paper guides 492 and 493 supported at opposite
armature into frictional driving contact with clutch ele
ends by frames 11 and 15 to guide each sheet of trans
ment 512 while still permitting the armature when ener
fer material forwarded by rollers 451 into the bite of
gized to overcome the force of the spring to operatively
rollers 4-01 and 4112.
engage the clutch element 511.
To permit the rollers 451 to clear a stack of transfer
To limit axial movement of the clutch assembly on
material in paper tray 498, as the tray is moved to its
the shaft SH~7, the inner race of the left-hand bearing
normal operating position as shown in FIG. 4, or when
507 is positioned by retaining ring 525 mounted in a
the tray is removed from its normal operating position,
there is provided a cam arm 494 and cam follower 495 to
pivot arm 454 to elevate the rollers 451.
suitable groove provided in the shaft.
The inner race
of the right-hand bearing abuts bearing 526 riding against
75 thrust washer 527 positioned against the inner face of
aosassa
12
f1
While the invention has been described with reference
to a preferred embodiment of the paper feed mechanism
disclosed herein, it is not con?ned to the details set forth
since many modi?cations and changes will become ap
parent to those skilled in the paper feeding art. This
application is intended to cover such modi?cations or
changes as may come within the purposes of the improve
ments or the scope of the following claims.
as
frame plate 1.1.
This structure also limits axial move
ment of the shaft in one direction, while axial movement
of the shaft in the opposite direction is limited by bear
ing 526 mounted between the compound pulley 5tl5
?xed to the shaft and thrust washer 527 positioned
against the inner face of frame plate 12.
The armature 51d, of conventional construction, is
connected to a suitable source of power, as described
hereinafter, through brushes 31 bearing on suitable col
What is claimed is:
lector rings 532 on the armature.
1. In a sheet feeding apparatus,
the combination of a frame,
Each brush, as shown in detail in FIG. 18, is slidably
mounted in a brush guide 533 and connected to a con
a feed tray mounted on said frame to support a stack
ductive line of the electrical circuit by means of a ter
of sheets,
feed rollers journaled in said frame in position to re
ceive a sheet from said feed tray,
minal strip 534. The brush guide is mounted in a
holder 535 and the terminal strip is inserted between a 15
?at on the brush guide and the holder 535 in electrical
contact with terminal 536 connected by wire 537 to the
brush. The terminal 536 is positioned in counterbored
to said feed rollers,
threaded portion of the holder and held therein by a
screw cap 538 so that the spring 541 encircling the wire
will bias the brush into electrical contact with a collector
ring. Both the holder 535 and screw cap 538 are made
of a suitable dielectric material.
The holders 535 ‘for the brushes are adjustably
mounted in collars 542 secured to the turned up legs of 25
component bracket 543 mounted on the base plate 16 of
the machine. Set screws 544 threaded in the collars are
used to secure the holders adjacent to the collector rings
in position for the brushes to contact the collector rings.
In FIG. 19, there is shown a simpli?ed wiring circuit 30
to effect operation of the clutch mechanism. As shown,
the armature of the magnetic clutch is connected in series
a driven shaft journaled in said frame,
a ?rst clutch element and a second clutch element
mounted in spaced relation on said driven shaft for
rotation relative to said driven shaft,
said ?rst clutch element being operatively connected
to said separator means,
said second clutch element being operatively connected
to said feed rollers,
an armature connected to said driven shaft for rota
tion therewith and positioned between said ?rst clutch
element and said second clutch element for axial
movement therebetween,
spring means positioned to normally bias said armature
into driving engagement with said second clutch
element,
with a normally open limit switch lLS to a suitable source
of electric power.
The limit switch lLS is closed, in timed relation to the 35
formation of an image on the Xerographic drum, to effect
operation of the paper separating rollers and the feed
rolls for feeding a sheet of transfer material into con
tact with the xerographic drum in registration with the
developed image on the drum as it is rotated through the
transfer station. Any suitable mechanism may be used
and energizing means positioned in electrical contact
with said armature to sequentially energize said ar
mature whereby said armature will move out of en
gagement with said second clutch element and into
driving engagement with said ?rst clutch element.
2. In a sheet feeding apparatus, the combination of a
frame,
a feed tray mounted on said ‘frame to support a stack
of sheets,
to actuate the limit switch, such as a programmer mecha
nism 59 of the type disclosed in the referenced co-pend
feed rolls journaled in said frame in position to re
ceive a sheet from said feed tray,
ing Mayo et al. application.
Referring now to the operation of the clutch mechanism
52, the armature 5714 of the clutch mechanism is nor
mally de-energized to enable the spring 518 to force the
armature into frictional driving engagement with the clutch
a separator means operatively connected to said frame
in position to feed sheets seriatim from said feed tray
1
element 512 to drive the paper feed roll 401. 'When the
limit switch llLS is actuated to energize the armature, the ‘
armature will move to the left, as seen in FIG. 17, against
the force of spring 518, out of engagement with clutch
element 512 and into driving engagement with clutch ele
ment 511 to effect operation of the paper separator rollers
451. As the separator rollers 451 are driven, they for
ward a sheet of transfer material into the V formed by
rollers 4d} and 4%2, Where its forward motion is mo
mentarily stopped. As the movement of a sheet of trans
fer material under separator rollers 451 continues after
the leading edge of the sheet has been stopped by rollers
M31 and ‘H92, the sheet is buckled as the separator rollers
continue to rotate. The rotation of the separator rollers
is continued just su?iciently to buckle the paper whereby
the resiliency of the paper forces the leading edge of the
sheet into transverse alignment with the rollers 4'61 and 65
462, irrespective of its original alignment thereto, so that
the sheet is forwarded by the feed rollers in correct align
ment onto the drum. As the actuating force on limit
switch lLS is removed to open the circuit, the armature
is de-energized, permitting it again to engage clutch ele
ment 512 through the biasing action of spring 518 to
operate feed roll 401 which in cooperation with feed roll
Hi2 advances the sheet into contact with the xerographic
drum.
75
a separator means operatively connected to said frame
in position to feed sheets seriatim ‘from said feed tray
to said feed rollers,
a driven shaft journaled in said frame,
a ?rst clutch element operatively connected to said
separator means,
and a second clutch element operatively connected to
said feed rollers,
said ?rst clutch element and said second clutch element
being mounted in spaced relation on said driven
shaft for rotation relative to said driven shaft,
an armature connected to said driven shaft for rota
tion therewith and positioned between said first clutch
element and said second clutch element for axial
movement therebetween,
spring means positioned to normally bias said arma
ture into driving engagement with said second clutch
element to drive said feed rollers,
and energizing means positioned in electrical contact
with said armature to sequentially energize said ar
mature Whereby said armature will move out of en
gagement with said second clutch element and into
driving engagement with said first clutch element to
actuate said separator means.
3. In a sheet feeding apparatus, the combination of a
‘frame,
a feed tray mounted on said ‘frame to support a stack
of sheets,
feed rollers journaled in said frame in position to re
ceive a sheet from said feed tray,
3,062,534
14
13
a separator means operatively mounted on said frame
in position to feed sheets seriatim from said feed tray
to said feed rollers,
a driven shaft journaled in said frame,
a ?rst clutch element and a second clutch element
mounted in spaced relation on said driven shaft for
rotation relative to said driven shaft,
said ?rst clutch element being operatively connected to
said separator means,
said second clutch element being operatively connected 10
to said feed rollers,
21 splined ‘hub ?xed to said driven shaft between said
?rst clutch element and said second clutch element,
an armature movably connected to said splined hub for
axial movement between said ?rst clutch element and
said second clutch element,
spring means positioned to normally bias said arma
ture into driving engagement with said second clutch
element,
and electrical circuit means positioned in electrical con
tact with said armature to sequentially energize said
armature whereby said armature will move out of
engagement with said second clutch element and into
driving engagement with said ?rst clutch element.
No references cited.
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